<!DOCTYPE html>
<head>
    <title>引入外部样式</title>

    <!-- 引入外部样式 -->
    <!--  <link rel="stylesheet" href="../css/xxxx.css"> -->
    <link rel="stylesheet" href="../css/demo01.css">
</head>

<body>
    <div>
        道可道非常道,名可名非常名
    </div>
</body>

</html>